Editing : Playlists : Playlists View : Resizing Playlist Lanes

Resizing Playlist Lanes
You can resize Playlist lanes the same way you resize tracks.
To resize the track and all Playlist lanes together, do one of the following:
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Click the line in between lanes and drag up or down. The track and all Playlist lanes resize accordingly.
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Right-click the vertical scale between the playlist area and the Playlist Lane controls and select the lane size you want. The track and all Playlist lanes resize accordingly.
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Press Start+Up/Down Arrow key (Windows) or Control+Up/Down Arrow key (Mac) to resize heights for tracks, playlists, and lanes containing the Edit cursor or Edit selection.
To resize a single Playlist lane, do one of the following:
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Control-click the line in between lanes and drag up or down. The upper lane resizes accordingly.
 
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Control-Right-click the vertical scale between the playlist area and the Playlist Lane controls and select the lane size you want.